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bfbf1a7ef3kernel: Expose btck_transaction_check consensus function (w0xlt) Pull request description: This PR exposes the consensus-level `CheckTransaction` function through the libbitcoinkernel C API and adds a corresponding C++ wrapper. Currently, libkernel only provided script-level validation via `btck_script_pubkey_verify` and `ScriptPubkeyApi<>::Verify`. AFAIK there was no way to perform context-free consensus checks on a transaction’s structure (e.g., coinbase rules, money-range, duplicate inputs). This change introduces a new API: ```c int btck_check_transaction(const btck_Transaction* tx, btck_TxValidationState** out_state); ``` and a C++ convenience wrapper: ```cpp std::pair<bool, TxValidationState> btck::CheckTransaction(const Transaction& tx); ``` Both follow the ownership and error-handling conventions established in `bitcoinkernel.h`. The test suite is extended with cases covering: * coinbase scriptSig length bounds * empty vin / vout detection * negative or out-of-range output values * duplicate inputs * null prevouts in non-coinbase transactions ACKs for top commit: alexanderwiederin: Re-ACKbfbf1a7ef3sedited: Re-ACKbfbf1a7ef3janb84: ACKbfbf1a7ef3Tree-SHA512: fe9ba555564af3258d9ccaea1b208df0aa2a4bf2fe74a8f861b3a3b3b891f2990ffc0e3b763d14f15568e977b70ee7337a5dc7d469c63098e0b43adc2ad80e3c
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